In this regard, the perioperative use of Cox-2 selective NSAIDs is advantageous for pain management after tonsillectomy. This could be shown for Rifecoxib, a selective Cox-2 inihibitor. For THAs with treatment of Etoricoxib, also a selective Cox-2 inhibitor, possible complications as the increased risk of haematoma, gastrointestinal bleeding and the need of blood transfusion could possibly be reduced. Selective Cox-2 inhibitors do not interfere with the coagulation system. Study results show that other selective Cox-2 inhibitors like meloxicam reduce perioperative blood loss. Thus, besides ensuring a good perioperative pain management, selective Cox-2 inhibitors may in addition cause less blood loss than non-selective NSAIDs.This possible reduction of blood loss during pain management with Etoricoxib (Arcoxia) will be investigated the described clinical trial.